42121424399 has 4 divisors (see below), whose sum is σ = 44599155264. Its totient is φ = 39643693536.

The previous prime is 42121424383. The next prime is 42121424447. The reversal of 42121424399 is 99342412124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42121424399 - 2⁴ = 42121424383 is a prime.

It is a super-2 number, since 2×42121424399² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42121424309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1238865407 + ... + 1238865440.

It is an arithmetic number, because the mean of its divisors is an integer number (11149788816).

Almost surely, 2^42121424399 is an apocalyptic number.

42121424399 is a deficient number, since it is larger than the sum of its proper divisors (2477730865).

42121424399 is a wasteful number, since it uses less digits than its factorization.

42121424399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2477730864.

The product of its digits is 124416, while the sum is 41.

The spelling of 42121424399 in words is "forty-two billion, one hundred twenty-one million, four hundred twenty-four thousand, three hundred ninety-nine".